Knowledge of concrete secondary pouring? What are the precautions for secondary pouring concrete?

The second pouring is the post-pouring belt.

The part is closed after the two sides are stabilized, which is for one-time pouring during the construction of the structure.

Strictly speaking, secondary pouring is not only for post-pouring belts. Common name: If the wall is higher, in order to ensure the quality of pouring vibration and the stability of the formwork, it is not allowed to pour to the top at one time, 500 height each time, and the pouring is completed before the final setting, which is called layered pouring and is not called secondary. There are also bulk concrete.

medium, such as a raft board.

The thickness is greater than 2m, in order to avoid excessive hydration heat, it cannot be poured to the top at one time, and it is poured twice to speed up the heat dissipation. According to the calorific value.

The second pouring time is often determined by the calculation after 7 days, which is also called the second pouring.

Generally, the secondary pouring is at the post-pouring belt site, which is determined by whether the final setting is the mark.

In addition, there is an expansion reinforcement belt, which is separated by a quick closing net, and the mechanism is the same as that of the post-expansion pouring belt. It's just that here it is poured with concrete on both sides, but the difference is that it is poured with expanded concrete, which can also compensate for shrinkage.

First of all, the treatment of the surface of the concrete poured for the first time or the selection of the concrete pouring shape (plane pouring or trapezoidal pouring), the surface treatment of the first poured concrete is the key to ensure that the cement of the second pouring has good cementation performance! Make it textured or pour it a second time before the concrete poured for the first time is not completely set!

The precautions when pouring concrete are as follows:

1. When the pouring height is greater than 2m, the string cylinder should be used, and the free height of the falling from the discharge nozzle to the pouring layer shall not be greater.

2. The concrete must be poured within 5 hours (from the time of departure), in order to prevent cold joints in concrete pouring.

Cold joint: refers to the construction quality joint formed by the pouring time interval of the upper and lower layers of concrete exceeding the initial setting time), the two concrete pouring times are not more than hours, and the junction is stirred uninterruptedly with a vibrating rod.

3. During the pouring process, the vibration duration should make the concrete surface produce floating slurry, no bubbles, and no sinking. The insertion points of the vibrator are evenly arranged in the shape of plum blossoms, and the sequence of the determinant movement is adopted, and the distance of the moving position should not be more than 40cm. Ensure that there is no vibration leakage, but no vibration.

4. When pouring the beam and slab concrete, pour the beam concrete first, start from the beam and column node parts, ensure that the beam and column node parts are vibrated and compact, and pour them together with the plate in the cycle of the slurry method, but there shall be no cold joints.

Key points of operation of secondary grouting:

1. Before grouting, the tap water at the grouting place should be cleaned, and kept tidy, and the oil stains, rust, etc. should be removed to ensure that the newly poured concrete (or cement mortar.

Firmly blends with the original concrete.

2. The grouting is generally made of soybean concrete, and its model should be at least one level higher than the original concrete marking. The particle size distribution of sand and gravel is about 5-15mm, and the concrete is 400 or 500.

3. When grouting, it is recommended to put the outer template around, and the edge of the outer template equipment base is usually not less than 60mm; If the total area at the bottom of the machine and equipment does not need to be fully grouted, and the grouting layer needs to bear the load of the machine and equipment, then in order to ensure the quality of the grouting layer, an internal formwork should also be placed.

4. The grouting work must be carried out continuously and shall not be terminated, the cement mortar is not allowed to be tamped in the whole grouting process, but it can be used for drainage, and the anchor screws and installation plan must be kept vertical.

5. After grouting, spread a towel and sprinkle water for maintenance, and the maintenance date shall not be less than one week.

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Hello, glad to answer for you. The secondary pouring concrete does not belong to the secondary structural concrete, and the secondary pouring is carried out after the first pouring of concrete is solidified. A quadratic structure is a part of a non-load-bearing structure.

The secondary structure is generally completed after the primary structure, and generally includes the construction of column covers, filling walls, partition walls, lintels, step floors, etc.

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Concrete construction should be very careful, otherwise problems are likely to occur, and at this time it is necessary to carry out secondary pouring. So what are the hazards of concrete secondary pouring? Let's take a look.

What are the hazards of secondary pouring of concrete

The secondary pouring of concrete will reduce the strength of concrete, affect its service life, and need to set up horizontal construction joints, which will affect the appearance of beauty. When the concrete is poured twice, it should be separated by a certain amount of time. If you want to pour in layers, you must ensure the cohesiveness of the upper and lower layers of concrete, and the upper layer should be poured before the lower layer solidifies.

What to pay attention to when pouring concrete

1. When the concrete is put into the mold, it can not concentrate on impacting the formwork of the building, if the pouring height is greater than 2 meters, it is necessary to use the string tube to cut the material, so as not to affect the concrete pouring effect too high. Lobbying.

2. After the concrete is mixed, it should be poured in a short period of time, which is generally controlled within 5 hours, and Shenwu touches it to avoid cold joint problems. Moreover, the two pouring times do not exceed 2 hours, and the junction of the building should be continuously stirred with a vibrating rod.

3. During the pouring process, the surface should be constantly vibrated and the time must be sufficient until the surface is free of bubbles and will not sink. The plum blossom-shaped vibrator can be used, which has a good vibration effect and is conducive to concrete pouring.

4. After the concrete is pressed and wiped, it should be cured on the surface. When it is finally set, it is necessary to sprinkle water on the surface first, and then cover it with a thin film to ensure that the concrete surface does not crack. It can also be covered on the surface with a straw curtain to have a good moisturizing and sunscreen effect.

5. When pouring, the concrete should be deployed in strict accordance with the proportion, and the amount of orange spikes of concrete should be paid attention to. In addition, it is necessary to pay attention to the speed of pouring, and the speed will also affect the effect of concrete pouring, so when constructing, it is necessary to strictly follow the set pouring speed.

I concluded: The above is about the hazards of concrete secondary pouring, I hope it will be helpful to everyone! In order to avoid the impact of the secondary pouring of concrete, it is necessary to be careful when pouring, and it is best to complete the concrete pouring at one time.

The 2-pouring handover of concrete refers to the situation in which the concrete construction needs to be poured in two or more stages for some reason. When dealing with 2 pouring handovers for concrete, the following steps are common:

1.First pouring: The first concrete pouring is carried out according to the design requirements. In the pouring process, it is necessary to pay attention to the uniformity and compactness of the concrete to ensure that the quality and strength of the pouring meet the requirements.

2.Environmental treatment: After the first letter jujube is carefully poured, it is necessary to carry out appropriate environmental treatment on the poured concrete to ensure that it is suitable for subsequent pouring conditions. This can include measures such as keeping the concrete surface wet, shading, mulching, etc.

3.Cleaning and preparation: On the surface of the concrete poured for the first time, cleaning and preparation work needs to be carried out to ensure that the second pouring can proceed smoothly.

This may include removing debris from the concrete surface, removing adhered membranes and contaminants, and preparing the joints for a second pour.

4.Binder treatment: On the surface of the concrete poured for the first time, an appropriate binder can be used to improve the bonding performance of the second pour to the first pour. This typically involves applying a binder to the joint to increase the bond strength between pours.

5.Second pouring: After the above preparatory work is completed, the second concrete pouring is carried out.

During the pouring process, it is necessary to pay attention to the connection with the first pouring to ensure the consistency and consistency of the concrete. At the same time, it is necessary to control the parameters such as slump, vibration and pouring speed of the second pouring according to the design requirements.

Through the above steps, the two pouring handovers of concrete can be effectively handled to ensure the integrity and performance of the concrete structure. It should be noted that when the concrete is poured for two times, the working performance, pouring temperature, curing conditions and other factors of the concrete should be fully considered to ensure the stability and consistency of the pouring quality. In practice, it is best to consult the guidance of a professional concrete technician or engineer.

Summary. The secondary pouring of reinforced concrete has an impact.

The code does not allow the secondary pouring of foundation concrete, which will reduce the strength and service life of reinforced concrete.

Does the secondary pouring of reinforced concrete have an impact.

The secondary pouring of reinforced concrete has an impact. The code does not allow the secondary pouring of foundation concrete, which will reduce the strength and service life of reinforced concrete.

So what should I do if there is an accident in the construction and the secondary watering?

In the secondary irrigation place, dust and debris should be removed first, and no debris such as sawdust should be left. When pouring concrete or mortar, the steel brazing should be used to vibrate and compact, and it is strictly forbidden to leak vibration. After vibrating, use an iron trowel to smooth and calender and scrape off the excess residue.

Three sets of concrete or mortar test blocks are left in place for testing and identification.

The builder put the living room cast-in-situ roof, from the new secondary pouring, now the living room roof is stressed on the steel bar, the wall and the beam are not stressed, so the construction is reasonable, will there be potential safety hazards.

According to the regulations, it is unreasonable and has potential safety hazards.

Questions like this: What should I do to protect my rights and interests?

If you have not yet delivered the property, it is recommended to negotiate with the developer to check out.

If the house has been handed over, it is recommended to consult a professional lawyer on how to deal with it.

Check out I would have lost a lot.

That's better than living in a house with safety hazards. Even if you don't check out, you have to fight for compensation. Again, if the developer is at fault first, and it is not your fault, it is recommended to consult a professional lawyer.

Okay thank you. Good luck.

Secondary pouring concrete is a technology that fills the gap between the base of the equipment and the surface of the foundation with fine gravel concrete or cement slurry and buries the horn in the concrete to fix the horn and bear the load of the equipment.

The contact surface of the two casts is indeed easier to pull apart than the whole pouring, but because the tensile bearing capacity of the concrete is not considered in the design of the concrete structure, as long as there is no water seepage, the tensile cracks are allowed.

If there is a structural stress bar in the place where it is poured twice, then the part that is poured first should be thrown out, and the length exceeds the anchorage length of the steel bar. When pouring for the second time, the contact surface of the first pouring part can be chiseled. If the part has waterproof requirements, then the pre-poured part should be reserved for waterproof steel plate or waterstop and other structural measures.

As long as the steel bar is reserved according to the specification, even if the concrete cracks in the layered place after pouring in stages, it will not affect the bearing capacity, but for the parts with waterproof requirements, it needs to be poured at one time.

The second pouring is to pour the concrete for the first time after solidifying, and then carry out the construction, intentionally leaving a construction joint, which we have done before, divide the bottom plate into two times, pour the first time, and clean the surface after a period of time and then pour the second time.

It is the post-pouring belt. To leave a construction joint for pouring concrete twice, it takes two months to pour one grade higher than the original concrete grade, which is called the second pouring of concrete.

That is, the pouring should be divided into two times, with a long interval, and the latter time is the second pouring.

It's the end of the work, and the concrete is poured again.

One-time pouring:

Advantages: The beam body is beautiful, and the concrete joints are reduced.

Disadvantages: the construction difficulty of the formwork project is high, the load that the box girder bottom template bears is relatively large, its support must be supported all the way to the bottom panel, the operation difficulty is large, and the scheme needs a large number of templates and supporting materials, is extremely unreasonable in economy, and the investment is large; The heat of hydration in the process of concrete hardening is high, and the corresponding measures are costly;

After the inner template of the box girder is installed, the space is narrow, and it is difficult for the worker master to vibrate, and the temperature is very high in the pouring process, and the safety of the worker is difficult to guarantee, and the vibration of the web and the bottom plate is difficult to meet the quality requirements, affects the subsequent tensioning work, and there is a great risk in the construction safety.

Secondary pouring:

Advantages: the beam formed by the first pouring concrete is used to support the self-weight and construction load of the second pouring concrete, and the safety of the support is increased; The inner formwork is installed and reinforced to directly support the beam floor to increase stability; Reduce a large number of formwork support materials; The corresponding measures have less cost, and at the same time, because the layered pouring of concrete can alleviate the excessive heat of hydration of large volumes, the adverse effect of temperature stress on the control of cracks;

Disadvantages: Horizontal construction joints need to be set up, which affects the integrity and appearance. After the first pouring is completed, the joints are chiseled and carefully cleaned with high-pressure water; For cosmetic issues, surface modification is carried out after the concrete is poured.